Boiler



D. M. NAIMITH. BOILER.

APPLICATION FILED FEB. I4, I92I.

1,432,721. Patented Oct. l?, i922.

3 SHEETS-SHEET ly `\\Il D. MNAISMITH.

BolLER. APPLICATION FILED FEB- l4. 1921.

Patented 001;. 17, w22.

3 SHEETS-SHEET 2 Pg/r2;

nga.

mM. NAISMITH.

mLER. APPL-ICATlON FILED 'FEB. I4. 192|. l

3 SHEETS-SHEET 3.

Patented' @et l?, QEE,

BQHALB BULISMITH, F ITTSURGH, PEIQ'NSYLVNI, ASSIGNOR, BY MESNEMSIGNEZENTS, 0F ONE-HALF T@ @HE RFCLEEEAN CORPORATION, 0F PITTS- 'URGH,LENNSYLVNI, CEPQRATON F PENS'YLVANIA.

ecrans.

Application ule etruary lll, leal. Serial Eto. fees.

To all whom t may concern .1

Be it known that L Donnino M. NMSMITH,

a citizen of the United States, residing at Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful improvements in Boilers, of which the tollowin is aspecification.

My' inventionre ates to improvements in the construction of water tub'eboilers, and

lo more particularly that class of boilers where the superimposed drumsor heads'are connected with lower mud drums or heads by plural banks ofcirculating tubes for the production of steam. I

The particular feature o invention involved herein is the provision of adrum 1nterposed between adjacent steam `olrurnsand l in' the course ofcirculation of steam, or of steam and water, in its passage to the finalsteam collecting drum, whereby to provide 'an intermediate separatingchamber for effecting complete separation of any entrained -waterfrom-the steam and delivery of resulting dry steam at the steam nozzle,even though the feed water may contain impurities which would causefoaming or priming in other constructions of boilers. The invention hasin view to eiect such desirable separation of entrained water from the'30 steam and also the prevention of any w'ater entering thesuperheater, if used.

ln the drawings, which illustrate certain preferred embodiments of theinvention, the boiler is rep; `:sented merely in cross section throughthe complete boiler setting, it being understood that the extent of theseveral drums and their banks of tubes may be ,to any desired degreilengthwise of the boiler unit, and that further illustration of such'construction is unnecessary to those familiar with this art. l

Fig. l is a View in cross section through a boiler setting constructedaccording to my invention;

Fig. 2 is a detail sectional view showing means for protecting theintermediate sepa- 'rating vdrum and omitting any bailling walls;

Figs. 3 and 4 are detail sectional views showing various arrangements ofbalflin walls in connection with the standard drum and connecting tubeconstruction;

Fig. 5 is a sectional detail view showing 'malnnpper water inlet andsteam j'7 are connected a modified construction `of intermediate drumand the circulation of, a portion ofthe gems therethrough from the:furnacel and baclr to the main circulation; tand F 6 is a furthersectional. detail'view showing the steam delivery drum provided with aperforated partition.

he entire boiler unit, as is usual, is enclosed within a settingutilizing supporting and'closing walls 2 withany suitable vfurnaceconstruction 3, and, if desired, fuel supply mechanism 4 of anyappropriate type. Suitable outlet connection for the gases of combustionleading tothe stack are,

necessarily of course, utilized but are not herein specificallyillustrated or described.

'lbe construction as illustrated utilizes a Supply drum 5, a lower muddrum 6, an upper water and steam drum 7, and an intermediete steamseparating drum 8. Primary drum aand mud .drum 6 are connected by thebank of tubes 9j, and drum and drum tubes '10 and 11, tion of the waterdownwardly through tubes 9, then upwardly through b ank of tubes 10 todrum 7, and downwardly through tubes 1l; to drum 6.

Drum 8, which is the novel feature of the invention, is located entirelyoutside of the water circulatory' system, and is furthermore elevatedentire y above the Awater level of drums 5 and 7. As shown, drum 5 isalso considerably higher and with a proportionately greater open areathan drum 7,` the cross area ofwhich is submerged to about its.J middle,as shown. YSeries of tubes 12 connect the upper portion of drum 7 withdrum 8 for carrying over into said drum steam from drum 7, together withany entrained water therein. neet the opposite side of drum 8 withprimary drum 5, whereby dry steam disassociated from any Water contentwhatever, is carried over from drum 8 and delivered to the steamcontaining drurii 5 having the usual outlet connection 14. It desired,tubes 13 may be increased toany desired number, as ata 13a, Fig. 3,whereby tov reducethe velocity of the steam in its4 passageA toward'drum 5.

Connected with over to the lower side by the associated banks ofproviding for main circula- Similar tubes 13 conportion of drum 5,preferably below the `water level thereof, are the tubes 15 by i whichany water separated from the steam in drum 8 is returned directly to thewater circulatory system through drum 5. ln a similar manner, series oftubes 16 connect drui'n 7 with drum 5 preferably below the water levelof each, whereby to provide for transverse circulation of water from oneto the other. These, however, may be omitted, if desired, withoutmaterially ailfecting the operation. The lower most drum 6 is providedwith a blow-ofix and drain pipe 17 for the purpose of conpletelyemptying the entire boiler, cleanirnr, the mud drum, etc. y

ln the construction shown in. Fig. 1, baffle plates or walls 18, 19, 20and 21 are located -at the positions and heights illustrated, to'

gether with addition al supplemental bafflingl walls or plates atvarious locations, as shown, whereby to provide for the circulan tion ofgases of combustion, as indicated by the arrows through the :severalbanks of tubes and lengthwise of them, as well as against the lower drum6, the gases finally passing out underneath upper drum 5 and betweentheindividual tubes 9 to the outlet stack.

' Incidentally, drum 8 may be provided with a detlecting or baille plateor abutment 22 whereby to interfere with the ldirect progress ot steam,or steam and water passing over through tubes 12, so as to break up itspassage directly to the tubes 13 leading to drum 5. By thisconstruction, any remaining associated water is vthoroughly andetf'ectually separated, and will drain off through tubes 4 The steam andwater being' thus separated in drum 8, the dry steam then passes throughtubes 13 to drum 5, for collection and use, as desired. The particularpurpose of the tubes 16 between drums 7 and 5 is to relieve 'anytendency of the water in drum 7 to pile up or accumulate therein,allowing it to freely passover to drum 5 and into the circulation.

Theimportance and advantage of the desirable circulation of steam andWater effected v by the construction within and through the `severalelements above described., lwill be appreciated from t-hc fact l thatthe steam is-first retrieved or collected in the substantmlly half .drumspace of drum 7, from whence it is then carried over intoi the `fullarea or space of drum 8, re-l served entirely for steam where crnnplcteand ypositive separation ot any entrained wateris etfected. From thisdrum, it is thenv conveyed over to 'the comparatively large space ofdrum' 5 which is consider. 'ably nxorc'tbzin half of its cross sectional.arca or drum space. so that the tendency 'of the steam to separatefrom. any associated water and to collect in an entirely dr7 form in thefinal delivery drum 5 is positively assisted and effected. Feed waterviay be initially supplied to the circulation by a pipe 23, connectedwith druin 5 below the water line, as shown.

By reason of the construction and arrangement of the three drums 7, 8and 5, and of plural tubes 13 when used, the velocity oit the steam isslowed down to a comparatively low rate in drum 8 and also in drum 5before it reaches the steam nozzle. Drum 8 beingr thus isolated entirelyout of the water circulatory system, offers its full, volurne for theslowing down and water separating process.

The baille 24C, as shown in Fig. 1, completely encloses the spacebetween drums and 5 above the tubes 16 and below tubes 12, 13 and 15 anddrum 8, so that drum 8 and said tubes are protected from the direct heatof the gases. However, ballie 2d or any portion of it may be omitted ifdesired, so as to utilize the gases of combustion with relation to theseelements. In 'Fig'. 2, I show the baille entirely omitted, but with aprotecting covering 25 around the underside of drum 8, supported in anysuitable manner, as by straps 26 depending from the construction.

ln Fig. 3, I show a portion only of the baffle wall as 24a at one side,exposing tubes 15 and 13 or 13 to the gases, while Fig. Il shows analternative arrangement ot baffle 24 vexposing tubes 12. Theconstruction otherwise is as already described, and the several partsare similarly identified by cor.L responding' numerals having theexponent a and 25 respectively. 1t will be understood, of course, thatany other variation or disposition of the battling walls may be utilizedso as to vary the heatingY effect as desired, within the judgement of'the designer or builder.

Fig. .5 shows the intermediate drum 8c of a modified construction,utilizing vertical' transverse vgas circulation tubes 27 and withanouter enclosing wall 28. In such case, the gas circulation is upwardlythrough a valve-controlled port 29 and thence over to and through thetubes 27 of the drum 8c, and then downwardlylas already described. lnthisarrangement, lymay utilize any number of individual drums 8 or 8cconnected 'with drums 7 and 5 byi the transverse steam 'customary feedwatersupply pipe 23 enterini;r at any suitable point belowthe uppersteam collecting chamber 30. A perforated partition 31extends'across themiddle portion of drum 5 and separates its lower water ice ISU

` This partition tends to segregate tne tubes, etc. The drum 8 providesfor coincontaining portion trom tbe steam collecting' chamber, above'the @veter inlet.,

Water endsteem cavities but, of course; -is not-Y necessarily utilized.The usual steam cntlet 32 is connected 'with tbe upper portion ofdruni5, es shown. f

The construction and operation oi? the boiler will be readilyuniierstoorl nini eppre elated oy ell tbe-se familier with the Thegeneral arrangement ot the several drums and circulating tubes provides`for ample anrljtliorough application oit tbe heet y of the furnecegases, and for the inclusion of any suitable or standarrl'iorm ofsnp-elieater, as indicated at 33. The entire construction is verycompact in design the steam generating elements have theirlieiiting)ysurfaces so presented to the path of the gases that they ere utilized intbe moet etn cient wey. The several elements proportionately arranged`for tbe loes-t results as to installation, location of the severalbattling Walls, repair or replacement of plete separation of theentrainecl water from the steam and consequent delivery of flry steanieven though tlie feed Water might contain impurities which would causetocining or priming in other boilers, n

A great advantage in tiiis respect is the.

Yprevention of slugs or entrainedwater en` tering the super-heater. l iiiirtiicr ativantage is the possibility o'obtaining' a superheating eectduring the trovel of tbe steam from drum 7 through tubes 1:2 to druinand from drum 8 through tubes 13 to drum 5. As shown,this;super-heatingeffect moy be regulated by varying the bait ing toclose oil any portion of the heating surfaces.

The rear bank of tubes 9 contributes to economy/'of the heat, While anuninterrupted circulotion is provided upvvarflly through tubes 3.0 sinddownwardly tlirouirli4 tubes ll, in tlie zone of greatest heet. Theinvention also provides 'for e. very ei'iicient battling, e highlydesirable super-heater location, and o very practicable furnace ac- Whatl claim is:

l. ln oivater tube boiler, the combination with tivo outermost upperwater circulation drums each having downwardly vcirculating heatingtubeconnections with ,tion 'and constituting the final isteam supply drinn,e lower mud drinn, and independent bsnli's of iiownnferclly circulating.Water tubes connecting eecli water circulation clruni with tlie niorttirurn, ot arreter operating steam dr nn Located between the upper(ironie above the water level thereof and having steam receiving`connection with one of tlie outer connection Vwith the other or finalsteam supply drum.

s water tube boiler, on upper drum in noter circulation with the'heating elenients of a boiler unit and provi-fled with a @veter inletand e steam outlet connection, an opposite upper drum also in Watercirculation vinili tlie heetingelenients of o boiler unit, and e drumintervening between said drums above the Water level thereof havingsteam receiving connection with eail opposite drum and steamA supplyconnection with tbe otlier i'lruin bef ing the Weiber' and. steonioutlet connection. t

niente of e boiler unit :incl provided with a water inletv and a steamoutlet connection,

an opposite upper drum also in water circulation with tbe heatingelementsof s boiler unit, and e, drum intervening between st' drums andSteam upplyin a Water tube boiler, an. upper drum' vin wete-rcirculation with the' heating elel said` drums above the Wcter levelthereof a of two outermost drums each innater re ,turn circulationwith/tbe beating elements of a boiler unit, one constituting e Waterreceiving and supply drinn and rovifleil Yivitii a steam outletconn'ectiom'o an intervening water separating steam drumj havingr steamreceiving connection with one of said outermost drums and aniiiterior-obstruction baille. plete extending across such'` connection,steam supply connection with the other or steein supply drum, and elower baille in protective relation to said intervening drum.

c f G. in o water tube boiler, the combination with :i pair of upperdrums in Water'.

return circulation with ovloiver drum by series ot banks of tubes, oneof seid upper drums having o water supply and a steam outlet, oi aiiiruni 'intervening between the upper drums elevated above 'the Waterlevel and provided with steam receiving. tubes connectingr it with oneof' said drums :ind steoin supply tubes connecting it with the other, adrain tube connecting tbe lower portion or" the intervening drum withthe steam outlet' drinn, and' a baille arranged below said middledrum'and circulation tubes. 1 K

i. ln a Watertube boilers the combinetioii with. o pair or upper in'wet/ei: circulation with Athe heating elements of a boiler unit, of anintervening steam separating unit, one havinga'steani outletconnection,of drum having a steam receiving commotionA an mtervening steamseparating drum havwith one of said drums and a steam snpply ing a steamreceiving connection with one connection with the other, and a steamteke- -5 of said drains and a steam supply and drainofi' connection withone of said upper water age connection with the other o1' steamoutdrums. 1 le: drum. In testimony whereof I hereunto a'ix my 8,. In aWater tube boiler, the combination signature. with, a pair'ogf upperdrums in water circu- 10 ation with-th heating elements of a boilerDONALD M. NAISMITH.

